There is only one good, knowledge, and one evil, ignorance.

唯一的好是知识，唯一的坏是无知。

youdao

There is only one good, knowledge, and one evil, ignorance.

世上只有一种善——知识；只有一种恶——无知。

youdao

Nature gave us only one good source of vitamin d, and that is the sun.

最天然的获取维生素d的方式只有一个：阳光。

youdao

Right now they have just the one truck and their business permit is good only in the city.

VOA: special.2010.04.12

Somewhere along the line in one damn incarnation or another, if you like, you not only had a hankering to be an actor or an actress, but to be a good one. You're stuck with it now.

在线路的某个地方，在化身或其他东西里，如果你想要，你不仅能渴望成为一个演员,也能成为一个出色的演员，你想现在是被困住了。

耶鲁公开课 - 1945年后的美国小说课程节选

Provided there's only one best competitor, not two equally good candidates.

前提是只有一个最佳竞争者，而不是两个同样优秀的候选人。

耶鲁公开课 - 死亡课程节选

In the end, there is only one good reason to imagine that the next Congress will get much done: because it has to.

ECONOMIST: Congress

Turns out I was the only person in our group -- including one guy who had only one good arm -- who didn't complete the ride.

WSJ: A Ride Across Iowa

Guess you only need one good one to get your CPA license revoked.

FORBES: David Friehling, Madoff's Accountant, Sentencing Postponed....Again